Ponies are going missing, and the ones that remain are acting strangely. Could it be that some old enemies of ponykind have returned, with unfinished business?

In the aftermath of the confusion with replacing the newest princess, a human arrives to learn about pony society.

When Twilight, Rainbow Dash, and Applejack are transported to an unknown world by a portal made by Twilight herself, they find not everything is right in this place. Can they band together with a group of unknown creatures and find a way home?